# -*- Python -*-

import os
import platform
import re
import subprocess
import tempfile

import lit.formats
import lit.util

from lit.llvm import llvm_config
from lit.llvm.subst import ToolSubst
from lit.llvm.subst import FindTool

# Configuration file for the 'lit' test runner.

# name: The name of this test suite.
config.name = 'MLIR'

config.test_format = lit.formats.ShTest(not llvm_config.use_lit_shell)

# suffixes: A list of file extensions to treat as test files.
config.suffixes = ['.td', '.mlir', '.toy', '.ll', '.tc', '.py', '.yaml', '.test', '.pdll', '.c']

# test_source_root: The root path where tests are located.
config.test_source_root = os.path.dirname(__file__)

# test_exec_root: The root path where tests should be run.
config.test_exec_root = os.path.join(config.mlir_obj_root, 'test')

config.substitutions.append(('%PATH%', config.environment['PATH']))
config.substitutions.append(('%shlibext', config.llvm_shlib_ext))
config.substitutions.append(("%mlir_src_root", config.mlir_src_root))
config.substitutions.append(("%host_cxx", config.host_cxx))
config.substitutions.append(("%host_cc", config.host_cc))


# Searches for a runtime library with the given name and returns a tool
# substitution of the same name and the found path.
# Correctly handles the platforms shared library directory and naming conventions.
def add_runtime(name):
    path = ''
    for prefix in ['', 'lib']:
        path = os.path.join(config.llvm_shlib_dir, f'{prefix}{name}{config.llvm_shlib_ext}')
        if os.path.isfile(path):
            break
    return ToolSubst(f'%{name}', path)


llvm_config.with_system_environment(
    ['HOME', 'INCLUDE', 'LIB', 'TMP', 'TEMP'])

llvm_config.use_default_substitutions()

# excludes: A list of directories to exclude from the testsuite. The 'Inputs'
# subdirectories contain auxiliary inputs for various tests in their parent
# directories.
config.excludes = ['Inputs', 'CMakeLists.txt', 'README.txt', 'LICENSE.txt',
                   'lit.cfg.py', 'lit.site.cfg.py']

# Tweak the PATH to include the tools dir.
llvm_config.with_environment('PATH', config.mlir_tools_dir, append_path=True)
llvm_config.with_environment('PATH', config.llvm_tools_dir, append_path=True)

tool_dirs = [config.mlir_tools_dir, config.llvm_tools_dir]
tools = [
    'mlir-opt',
    'mlir-tblgen',
    'mlir-translate',
    'mlir-lsp-server',
    'mlir-capi-execution-engine-test',
    'mlir-capi-ir-test',
    'mlir-capi-llvm-test',
    'mlir-capi-pass-test',
    'mlir-capi-pdl-test',
    'mlir-capi-quant-test',
    'mlir-capi-sparse-tensor-test',
    'mlir-capi-transform-test',
    'mlir-cpu-runner',
    add_runtime('mlir_runner_utils'),
    add_runtime('mlir_c_runner_utils'),
    add_runtime('mlir_async_runtime'),
    'mlir-linalg-ods-yaml-gen',
    'mlir-reduce',
    'mlir-pdll',
    'not',
]

if config.enable_spirv_cpu_runner:
    tools.extend(['mlir-spirv-cpu-runner', add_runtime('mlir_test_spirv_cpu_runner_c_wrappers')])

if config.enable_vulkan_runner:
    tools.extend([add_runtime('vulkan-runtime-wrappers')])

if config.enable_rocm_runner:
    tools.extend([add_runtime('mlir_rocm_runtime')])

if config.enable_cuda_runner:
    tools.extend([add_runtime('mlir_cuda_runtime')])

# The following tools are optional
tools.extend([
    ToolSubst('toyc-ch1', unresolved='ignore'),
    ToolSubst('toyc-ch2', unresolved='ignore'),
    ToolSubst('toyc-ch3', unresolved='ignore'),
    ToolSubst('toyc-ch4', unresolved='ignore'),
    ToolSubst('toyc-ch5', unresolved='ignore'),
    ToolSubst('toyc-ch6', unresolved='ignore'),
    ToolSubst('toyc-ch7', unresolved='ignore'),
    ToolSubst('%mlir_lib_dir', config.mlir_lib_dir, unresolved='ignore'),
    ToolSubst('%mlir_src_dir', config.mlir_src_root, unresolved='ignore'),
])

python_executable = config.python_executable
# Python configuration with sanitizer requires some magic preloading. This will only work on clang/linux.
# TODO: detect Darwin/Windows situation (or mark these tests as unsupported on these platforms).
if "asan" in config.available_features and "Linux" in config.host_os:
  python_executable = f"LD_PRELOAD=$({config.host_cxx} -print-file-name=libclang_rt.asan-{config.host_arch}.so) {config.python_executable}"
# On Windows the path to python could contains spaces in which case it needs to be provided in quotes.
# This is the equivalent of how %python is setup in llvm/utils/lit/lit/llvm/config.py.
elif "Windows" in config.host_os:
  python_executable = '"%s"' % (python_executable)
tools.extend([
  ToolSubst('%PYTHON', python_executable, unresolved='ignore'),
])

llvm_config.add_tool_substitutions(tools, tool_dirs)


# FileCheck -enable-var-scope is enabled by default in MLIR test
# This option avoids to accidentally reuse variable across -LABEL match,
# it can be explicitly opted-in by prefixing the variable name with $
config.environment['FILECHECK_OPTS'] = "-enable-var-scope --allow-unused-prefixes=false"

# Add the python path for both the source and binary tree.
# Note that presently, the python sources come from the source tree and the
# binaries come from the build tree. This should be unified to the build tree
# by copying/linking sources to build.
if config.enable_bindings_python:
  llvm_config.with_environment('PYTHONPATH', [
      os.path.join(config.mlir_obj_root, 'python_packages', 'mlir_core'),
      os.path.join(config.mlir_obj_root, 'python_packages', 'mlir_test'),
  ], append_path=True)

if config.enable_assertions:
  config.available_features.add('asserts')
else:
  config.available_features.add('noasserts')

def have_host_jit_feature_support(feature_name):
  mlir_cpu_runner_exe = lit.util.which('mlir-cpu-runner', config.mlir_tools_dir)

  if not mlir_cpu_runner_exe:
    return False

  try:
    mlir_cpu_runner_cmd = subprocess.Popen(
        [mlir_cpu_runner_exe, '--host-supports-' + feature_name], stdout=subprocess.PIPE)
  except OSError:
    print('could not exec mlir-cpu-runner')
    return False

  mlir_cpu_runner_out = mlir_cpu_runner_cmd.stdout.read().decode('ascii')
  mlir_cpu_runner_cmd.wait()

  return 'true' in mlir_cpu_runner_out

if have_host_jit_feature_support('jit'):
  config.available_features.add('host-supports-jit')
